Reactor reactivity measurement method and system

Abstract

The present invention discloses a reactor reactivity measurement method and system, which relates to the field of reactor nuclear measurement. The key points of its technical solution are: performing weak current-to-voltage conversion and multi-channel filtering processing on the detector current signal; conditioning the rod position signal of the rod position to be measured; dynamically configuring the sampling rate, acquisition conditioning conversion gear and multiple weighting coefficients according to the measurement range and measurement method of the multiple first voltage signals; fusing the multiple weighting coefficients and the multiple first current signals; and obtaining a corrected composite current value after time synchronization processing of the composite current value according to the rod position conditioning signal. The present invention adopts full digital signal conditioning and synchronous acquisition of the detector signal current and the rod position signal to be measured to improve the accuracy of the parameter correction model. At the same time, it adopts multi-filter path conditioning and weighted correction to obtain corrected data for the matching data measurement method. In addition, it adopts dynamic loading of configuration parameters to realize microcurrent signal conditioning, acquisition, and initialization of correction parameters.

Description

Technical Field

[0001] The present invention relates to the field of reactor nuclear measurement, and more particularly to a reactor reactivity measurement method and system. Background Art

[0002] Reactor physics core design requires technical verification through corresponding experiments. Experimental methods for reactor zero-power physics involve neutron flux measurement, power measurement, neutron noise, and reactivity parameter measurement techniques, all of which utilize current-type gamma-compensated ionization chambers as detectors and utilize corresponding data analysis models to obtain the target measured parameters. Power measurement and protection devices, digital reactivity meters, and absolute power meters in power reactors or zero-power devices measure neutron variations within the reactor from outside the reactor. By conditioning the weak current signals generated by these neutron variations, the collected data is then combined with corresponding model algorithms to determine the reactor's neutron flux, power, reactivity, and other parameter values.

[0003] Existing neutron weak current reactor physics experiment reactivity measurement instruments are mostly designed with single- or dual-channel integrated architectures and are mostly used for zero-power physics testing of new research reactor cores and smaller marine power reactor cores. Signals are typically acquired through an attached neutron detector, which includes a long signal (or high-voltage) cable and an instrument measurement host. However, their major drawbacks are the distributed capacitance of the long cable and the introduction of wiring noise interference, which degrades the signal-to-noise ratio and time response characteristics. These single-instrument designs cannot meet the requirements of multi-channel coupled measurement and analysis test scenarios. Alternatively, they are customized specifically for reactor core reactivity measurements in specific test scenarios (such as nuclear power plant power cores). These instruments primarily focus on data acquisition and subsequent data calculation and analysis. Neutron detector microcurrent signals in their nuclear measurement system are typically acquired via a communication bus, sharing a signal source with the nuclear power plant reactor instrumentation and control system (I&C) system. The signal source parameter characteristics depend on the I&C system configuration, making it impossible to carry out diversified testing and analysis as required. Furthermore, key technical performance indicators (such as data signal-to-noise ratio, response time, filter time response, and data sampling frequency) cannot be arbitrarily optimized or modified.

[0004] Therefore, how to research and design a reactor reactivity measurement method and system that can overcome the above-mentioned defects is a problem that we urgently need to solve. Summary of the Invention

[0005] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a reactor reactivity measurement method and system, which adopts full digital signal conditioning and synchronous acquisition of the detector signal current and the rod position signal to be measured to improve the accuracy of the parameter correction model, and at the same time adopts multi-filter path conditioning and weighted correction to obtain corrected data for the matching data measurement method; in addition, dynamic loading of configuration parameters is adopted to realize microcurrent signal conditioning, acquisition, and initialization of correction parameters.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] In a first aspect, a method for measuring reactor reactivity is provided, comprising the following steps:

[0008] Performing weak current-to-voltage conversion and multi-channel filtering on the collected detector current signal to obtain multiple first voltage signals;

[0009] Conditioning the collected rod position signal of the rod position to be measured to obtain a rod position conditioning signal;

[0010] Performing analog-to-digital conversion on the multiple first voltage signals and the rod position conditioning signals respectively to obtain corresponding digital signals;

[0011] Dynamically configuring a sampling rate, an acquisition and conditioning conversion gear, and a plurality of weighting coefficients according to a measurement range and a measurement method of multiple first voltage signals represented by digital signals;

[0012] Converting the multiple first voltage signals into multiple first current signals, and fusing the multiple weighting coefficients with the multiple first current signals to obtain a composite current value;

[0013] The synthetic current value is subjected to time synchronization processing according to the rod position conditioning signal to obtain a corrected synthetic current value, and the reactivity measurement and analysis is realized based on the corrected synthetic current value.

[0014] Furthermore, the method further comprises:

[0015] The actual sampling rate of the multiple first voltage signals and the rod position conditioning signals during analog-to-digital conversion is adjusted in real time according to the configured sampling rate.

[0016] Furthermore, the method further comprises:

[0017] The current operating sample rate setting for analog-to-digital conversion is adjusted in real time according to the configured sample rate.

[0018] Furthermore, the process of obtaining the synthetic current value is specifically as follows:

[0019] Multiplying the weighting coefficient by the first current signal converted from the output corresponding to the corresponding filter channel to obtain a second current value;

[0020] The multiple second current values ​​are summed to obtain a composite current value.

[0021] Furthermore, the process of obtaining the corrected composite current value is specifically as follows:

[0022] According to the initial sampling time of the rod position conditioning signal and the rod position interval value, the spatial correction factor at the corresponding moment is matched to obtain a spatial correction factor sequence;

[0023] Each sampling rod site is used as a link to realize the time-related mapping between the spatial correction factor and the synthetic current value, and the synthetic current value corrected at the corresponding moment is calculated by the product of the spatial correction factor and the synthetic current value associated with the corresponding moment.

[0024] In a second aspect, a reactor reactivity measurement system is provided, comprising:

[0025] A current processing module is used to perform weak current-to-voltage conversion and multi-channel filtering on the collected detector current signal to obtain multiple first voltage signals;

[0026] The rod position conditioning module is used to condition the collected rod position signal of the rod position to be measured to obtain a rod position conditioning signal;

[0027] The ADC acquisition module is used to perform analog-to-digital conversion on the multiple first voltage signals and the rod position conditioning signals to obtain corresponding digital signals;

[0028] MCU control module, used for:

[0029] Dynamically configuring a sampling rate, an acquisition and conditioning conversion gear, and a plurality of weighting coefficients according to a measurement range and a measurement method of multiple first voltage signals represented by digital signals;

[0030] Converting the multiple first voltage signals into multiple first current signals, and fusing the multiple weighting coefficients with the multiple first current signals to obtain a composite current value;

[0031] The synthetic current value is subjected to time synchronization processing according to the rod position conditioning signal to obtain a corrected synthetic current value, and the reactivity measurement and analysis is realized based on the corrected synthetic current value.

[0032] Furthermore, the system also includes:

[0033] The sampling rate configuration module is used to adjust the current working sampling rate setting of the ADC acquisition module in real time according to the configured sampling rate.

[0034] Furthermore, the system also includes:

[0035] The feedback drive module is used to adjust the current working sampling rate setting of the ADC acquisition module in real time according to the configured sampling rate.

[0036] Furthermore, the current processing module includes:

[0037] A current-to-voltage unit is used to perform I / V conversion on the detector current signal to obtain a voltage signal;

[0038] The filtering unit is used to filter the voltage signal through three parallel processing channels with different filtering frequency configurations to obtain

[0039] The first level conversion unit is used to reduce or amplify the filtered voltage signal to a voltage sampling range set in the ADC acquisition module.

[0040] Furthermore, the rod position adjustment module includes:

[0041] A signal conditioning unit, used for conditioning the rod position signal of the rod position to be measured;

[0042] The second level conversion unit is used to reduce or amplify the conditioned stick position signal to within the voltage sampling range set in the ADC acquisition module.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The present invention provides a reactor reactivity measurement method that uses fully digital signal conditioning and synchronous acquisition of the detector signal current and the rod position signal to be measured to improve the accuracy of the parameter correction model. At the same time, multi-filter path conditioning and weighted correction are used to obtain corrected data that matches the data measurement method. In addition, dynamic loading of configuration parameters is used to realize microcurrent signal conditioning, acquisition, and initialization of correction parameters.

[0045] 2. The present invention can be adapted to the occasions requiring high-efficiency experimental measurement of reactivity based on multi-parameter correction and dynamic configuration, rapid expansion of adaptive networking, synchronous signal acquisition and correction, high precision, and online real-time analysis, etc., and can make up for the poor time characteristics of the existing reactivity instrument under the long coaxial cable and the poor lower limit index of the micro-current conditioning unit (about 10 -10 A~10 -9 A), poor anti-interference ability (signal-to-noise ratio), few channels and inability to network, no real-time correction and dynamic parameter configuration functions, non-standard interface size and large and heavy weight, low experimental measurement efficiency, etc.

[0046] 3. This invention effectively improves the adaptability, efficiency, and safety of the instrument's test scenarios and experimental measurement tasks, obtains better signal-to-noise ratio and time response characteristics, measures real-time and comprehensive data, increases data mining potential, and improves the accuracy of experimental results after correction and analysis, greatly improving the quality of reactive measurement analysis results and the value of data mining.

[0047] 4. Aiming at the deficiencies of existing reactor digital reactivity instruments and the need for data fusion correction analysis models, the present invention designs a dedicated module for digital reactivity instruments under a standard interface and circuit size template, thereby realizing an extensible distributed architecture and modular design of the digital reactivity instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0049] Figure 1 This is a flowchart of Example 1 of the present invention;

[0050] Figure 2 This is a schematic diagram of the three-channel filtering fusion principle in Example 1 of the present invention;

[0051] Figure 3 is a schematic diagram of the filter loading model in Example 1 of the present invention;

[0052] Figure 4 This is a schematic diagram of the principle of synchronous acquisition of multiple signals in Example 1 of the present invention;

[0053] Figure 5 This is a system block diagram in Example 2 of the present invention. DETAILED DESCRIPTION

[0054] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0055] In the reactor core physical parameter measurement method based on current-type neutron detector, since the measuring instrument works in the middle zone during the reactor startup process, the neutron flux in the core environment is about 10 -6 ~10 -8 n / (cm 2 .s), the detector outputs a weak signal that needs to be output to a radiation-resistant and safe location on the device. The signal transmission process is susceptible to interference from external environmental signals, and the presence of distributed capacitance leads to poor signal response characteristics, posing challenges to quickly and accurately obtaining and measuring the detector's weak current signal. To meet the current high-efficiency requirements of zero-power physics testing, high-quality experimental data results, diverse test scenarios, and complex (electromagnetic) environments, and given the presence of objective factors such as zero-power physics test power limits, measurement end radiation tolerance limits, statistical fluctuations in neutron detection, and real-time transmission of weak signals, the requirements for high signal-to-noise ratio conditioning performance of the measuring instrument's weak current signal, ultra-low measurement limit indicators, and fast detector current time response characteristics during the test are higher.

[0056] Given the aforementioned state of the art, addressing existing deficiencies necessitates exploring new design paths for reactivity measurement instruments, achieving standardized, compact, integrated, and intelligent modular designs based on a portable, multifunctional instrument architecture. This invention combines technologies such as fully digital channel synchronous acquisition, real-time result correction, dynamic parameter configuration, and sensitive circuit shielding design with a bus-based, distributed layout architecture and on-site radiation-resistant shielding measures to advance measurement theory and analytical calculation models for reactor physics experiments.

[0057] Example 1: A method for measuring reactor reactivity, such as Figure 1 As shown, the following steps are included:

[0058] S1: performing weak current-to-voltage conversion and multi-channel filtering on the collected detector current signal to obtain multiple first voltage signals;

[0059] S2: Conditioning the collected rod position signal of the rod position to be measured to obtain a rod position conditioning signal;

[0060] S3: Perform analog-to-digital conversion on the multiple first voltage signals and the rod position conditioning signals to obtain corresponding digital signals;

[0061] S4: Dynamically configuring a sampling rate, an acquisition and conditioning conversion gear, and a plurality of weighting coefficients according to a measurement range and a measurement method of the multiple first voltage signals represented by digital signals;

[0062] S5: converting the multiple first voltage signals into multiple first current signals, and fusing the multiple weighting coefficients with the multiple first current signals to obtain a composite current value;

[0063] S6: The composite current value is subjected to time synchronization processing according to the rod position conditioning signal to obtain a corrected composite current value, and reactivity measurement and analysis is performed based on the corrected composite current value.

[0064] The process of obtaining the composite current value is specifically as follows: multiplying the weighting coefficient with the first current signal converted from the output corresponding to the corresponding filter channel to obtain a second current value; and summing multiple second current values ​​to obtain the composite current value.

[0065] like Figure 2 As shown in the figure, the best measurement and analysis method is selected by measuring the target in the reactive measurement. In order to meet the dynamic precise matching of the selected measurement and analysis method, full data scene acquisition is adopted. After the I / V conversion of the microcurrent signal introduced by the detector, it enters three parallel processing channels with different filter frequency configurations for processing, and the three current data are collected synchronously.

[0066] The instrument module uses theoretical analysis and experimental verification to determine the optimal filtering parameters for modes such as small reactivity tracking measurement, temperature coefficient measurement, pressure coefficient measurement, falling rod method measurement, and inserted rod method measurement. Parameter selection primarily involves setting the sampling rate (which is associated with the time interval δt in the host computer application software) and adapting the weighting coefficients k1, k2, and K3. The sampling rate can be set to the following values: 1000Hz (1ms), 200Hz (5ms), 100Hz (10ms), 50Hz (20ms), 20Hz (50ms), 10Hz (100ms), and 5Hz (200ms). The selection of these values ​​depends primarily on factors such as the signal measurement range, the current measurement mode, the network bus bandwidth, and the real-time computing power of the host computer software. The weighting coefficients k1, k2, and k3 are determined based on the signal measurement range, the current measurement mode, and the characteristics of the coaxial cable from the detector to the conditioning end (such as length, insulation, distributed capacitance, and low-noise characteristics).

[0067] For example, the weighting coefficient value model is mainly determined by the gear characteristics of the collected current value. The specific model is as follows:

[0068] k1=(|-4-d|) / 15 ①

[0069] k2=(|-9-d|) / 15 ②

[0070] k3=(|-13-d|) / 15 ③

[0071] In the above formula, d is the gear value of the current circuit. The gear value is dynamically obtained during the measurement process and can be -13, -12, -11, -10, -9, -8, -7, -6, -5, or -4. According to the above model, it can automatically switch and adapt during the measurement process.

[0072] In addition, empirical values ​​can also be obtained based on actual specific scenario conditions. The specific parameter selection table is shown in Table 1.

[0073] Table 1 Parameter selection correspondence table

[0074]

[0075]

[0076] According to the actual scene demand factors, the parameter selection table is adapted to determine the corresponding relationship between the data sampling rate, the weighted coefficient in the three-way weighted fitting model and the optimal filtering parameters, so as to realize the flexible dynamic configuration requirements in the data collection and analysis process, the data is accurately measured, and the filtering loading model is as follows: Figure 3 shown.

[0077] The dynamic weighted filter loading model is a model that combines hardware filtering with software algorithm optimization. Based on this model, it can be built into the measurement analysis software. According to the judgment threshold condition parameters, the appropriate configuration parameters are automatically loaded and issued, so that the measurement module circuit can be quickly adapted to meet the current measurement mode and detection measurement signal range. The above process greatly enhances the efficient performance of dynamic parameter adjustment of the instrument module during operation, and enhances the adaptability, measurement expansion performance and accuracy of refined measurement during the instrument test and measurement process.

[0078] In addition, the present invention also adjusts the actual sampling rate of the multiple first voltage signals and the rod position conditioning signals during analog-to-digital conversion in real time according to the configured sampling rate.

[0079] In addition, the present invention also adjusts the current working sampling rate setting of the analog-to-digital conversion in real time according to the configured sampling rate.

[0080] The specific process of obtaining the corrected synthetic current value is as follows: according to the initial sampling time of the rod position conditioning signal and the rod position interval value, the spatial correction factor at the corresponding moment is matched to obtain the spatial correction factor sequence; each sampling rod position is used as a link to realize the time association mapping between the spatial correction factor and the synthetic current value, and the synthetic current value corrected at the corresponding moment is calculated by the product of the spatial correction factor and the synthetic current value associated with the corresponding moment.

[0081] By synchronously collecting multiple signals, the accuracy of the data correction model is improved. Specifically, the rod position and the detector current that calculates the current rod reactivity are synchronously collected to solve the problem of previous design or data processing that did not consider data synchronization or did not estimate and correct data synchronization, which caused the introduction and transmission of errors and was not conducive to the accuracy of data analysis and processing. When making corrections, it is also necessary to experimentally explore the response time of the reactor reactivity changes caused by the rod position changes, such as Figure 4 shown.

[0082] The three-way current is collected synchronously with the rod position, and each sampling value is aligned with the time moment as the reference. Figure 4 The process ① realizes each sampling time t n The corresponding three-way filter current value i n and stick position value b n The three filtered current values ​​are combined into a current value I at the corresponding moment through the weighted coefficient. n ; Process ② Load the initial space correction factor Y based on the rod position through software n , combined with the synchronously collected rod position interval value △b, the initial spatial factor is adapted (interpolation expansion or point compression, etc.) to obtain the adaptable spatial correction factor y that can be matched with the current rod position sampling interval n ; Process ③ uses each sampling rod site as a link to find the corresponding time and space correction factor, and maps it to the corresponding current value I through time associationn , to achieve the spatial factor y of the current at each rod position sampling point in the rod drop measurement mode and rod insertion measurement mode n *Synthetic current value I n Correction; Process ④ is to conduct dynamic tracking and correction of the whole process in real time according to the inverse dynamic equation of the reactivity to obtain more accurate measurement and analysis results.

[0083] It should be noted that the three-way filtered current value requires converting the voltage signal synchronously collected by AD into a current signal according to the resistance value in the measurement gear, and then analyzing it based on the current information.

[0084] Example 2: A reactor reactivity measurement system, such as Figure 5 As shown, it includes a current processing module, a rod position conditioning module, an ADC acquisition module, an MCU control module, a sampling rate configuration module and a feedback drive module.

[0085] The current processing module is used to perform weak current-to-voltage conversion and multi-channel filtering on the collected detector current signal to obtain multiple first voltage signals.

[0086] The rod position conditioning module is used to condition the collected rod position signal of the rod position to be measured to obtain a rod position conditioning signal.

[0087] The ADC acquisition module is used to perform analog-to-digital conversion on the multiple first voltage signals and the rod position conditioning signals to obtain corresponding digital signals.

[0088] The MCU control module is used to: dynamically configure the sampling rate, acquisition conditioning conversion gear and multiple weighting coefficients according to the measurement range and measurement method of multiple first voltage signals represented by digital signals; convert the multiple first voltage signals into multiple first current signals, and fuse the multiple weighting coefficients and the multiple first current signals to obtain a composite current value; obtain a corrected composite current value after time synchronization processing of the composite current value according to the rod position conditioning signal, and realize reactive measurement and analysis based on the corrected composite current value.

[0089] The sampling rate configuration module is used to adjust the current working sampling rate setting of the ADC acquisition module in real time according to the configured sampling rate.

[0090] The feedback drive module is used to adjust the current working sampling rate setting of the ADC acquisition module in real time according to the configured sampling rate.

[0091] The present invention adopts network or bus communication function, online parameter configuration and data transmission to realize distributed cascade connection. Micro current 10 is realized inside the unit. -4 ~10 -13The device can adjust the range of A, automatically switch gears, and output a fully digital microcurrent signal. The sampling rates are 5Hz, 10Hz, 20Hz (50ms), 50Hz (20ms), 100Hz, 200Hz, 1kHz, 100Hz (10ms), and 10Hz (100ms). It supports manual and automatic range switching, and the output data does not fluctuate significantly during automatic range switching. The digital communication transmission signal includes configuration parameter information (sampling rate, filtering parameters, gear connection processing mode, etc.), high-voltage state detection information, high-voltage load current information, position measurement value, microcurrent measurement value, gear information, etc. The ionization chamber is loaded with positive and negative high voltages. Under the action of the electric field, the radioactivity of the nuclear reaction is ionized in the sensing area to produce positive and negative charged particles moving in opposite directions, thereby forming an electric current.

[0092] The current processing module includes a current-to-voltage unit, a filtering unit, and a first level conversion unit. The current-to-voltage unit performs I / V conversion on the detector current signal to generate a voltage signal. The filtering unit filters the voltage signal through three parallel processing channels configured with different filtering frequencies to generate a voltage signal. The first level conversion unit reduces or amplifies the filtered voltage signal to within the voltage sampling range set in the ADC acquisition module.

[0093] The rod position conditioning module includes a signal conditioning unit and a second level conversion unit. The signal conditioning unit is used to condition the rod position signal of the rod position to be measured; the second level conversion unit is used to reduce or amplify the conditioned rod position signal to the voltage sampling range set in the ADC acquisition module.

[0094] Microcurrent signal conditioning primarily involves primary amplification of weak current signals through transimpedance conversion circuits. The amplified signals fall within the ultra-microcurrent range, requiring classic protection techniques for leakage prevention and interference immunity. High-precision ADCs are then used for data acquisition to meet on-site digitization requirements.

[0095] like Figure 5 As shown, the microcurrent interface can detect the weak current (10 -4 A~10 -13 A) is introduced into the dedicated module for reactivity instrument measurement. The present invention adopts the BNC connector of triaxial Q9, and is designed with the middle core layer as signal +, the outermost layer as signal -, and the middle layer as the guard layer. The measurement of weak current signal is achieved through a resistor feedback network to achieve wide range conversion measurement. The basic principle of conversion is V o =I in *R 反馈The resistor feedback network uses special resistors with high precision and low temperature drift, and its resistance values ​​are composed of 100G, 1G, 10M, 100K, and 10K resistors; after the voltage is collected, it passes through a combined filtering module based on a weighted coefficient to improve the measurement accuracy and signal-to-noise ratio in the low measurement range during the signal transmission and conditioning process, and ensure the fast response characteristics of the signal in the appropriate measurement range.

[0096] The level converter reduces or amplifies the signal sent from the front end to the voltage sampling range set by the back-end ADC to avoid damaging the ADC chip. The ADC acquisition function converts the front-end analog signal into a digital signal that can be processed by the instrument's subsequent digital communication and software. The ADC has four acquisition channels, three for weak current conversion signals and one for rod position conditioning. The power interface provides the required low-voltage DC power for the reactivity measurement module. The signal also passes through the buffer output module and the output interface module, providing an analog signal debugging interface to enable debugging, testing, inspection, and maintenance of the reactivity measurement module. The buffer output module isolates the main signal link to prevent external interference with the measurement channel. The MCU control module determines the current feedback resistor range based on the ADC sampling value and selects the feedback resistor in the feedback resistor network through the range switching driver circuit. The current acquired voltage is divided by the current feedback resistor value to obtain the corresponding current value preprocessing. Finally, the current value is transmitted to the reactivity host computer or multi-function measurement system via the RJ45 interface, RS485 interface, or CAN bus interface, enabling real-time reactivity measurement.

[0097] In addition, the input interface of the present invention uses a dedicated weak signal interface with double-layer shielding protection technology to ensure that the leakage current is less than 100fA. The inner shield needs to be protected by equipotential protection technology, and the outer shield uses ground (chassis) shielding to reduce electromagnetic interference. The input protection mainly protects against electrostatic damage, using standard ESD diodes for clamping protection, and is combined with a 50mA self-recovery protection fuse to implement overcurrent protection to prevent the internal amplification circuit from being damaged by external signals.

[0098] The primary amplifier for weak currents utilizes a classic weak current amplification mode. The resistive feedback network consists of resistors and capacitors. The feedback network is switched according to MCU instructions, enabling multi-level controllable ranges. Range switching utilizes ultra-low leakage current relays, with leakage resistance as low as 1T and response time in the millisecond range, ensuring safe, fast, and reliable range switching. The primary op amp utilizes an ADI electrometer JFET output amplifier, guaranteeing femtoampere-level error levels. The resistive feedback network utilizes ultra-high-performance resistors and capacitors in parallel, with resistors ranging from 100G to 10K, and a temperature drift of 50ppm / °C at 100G. When switching resistors, attention must be paid to the crossover time between two ranges to prevent the op amp from opening its loop and causing the output to reach the power rail. Capacitors utilize RS ultra-low leakage current polypropylene film capacitors, with leakage resistance no less than 1T and excellent muon absorption efficiency, meeting design requirements.

[0099] The filter circuit uses a 4th-order Butterworth active filter to eliminate input interference, with a cutoff frequency of 1kHz. The output buffer uses a capacitor-driven circuit to ensure signal integrity after the drive cable, reducing the adverse effects of cable capacitance.

[0100] The control processor uses an STM32F4 core processor to implement a series of functional requirements for the preamplifier, including command parsing, GPIO control, and ADC acquisition and processing. To meet digital requirements, the preamplifier is designed with a high-precision ADC, allowing for high-speed, high-precision signal conversion at 1kHz. The communication system primarily uses network communication, with mature network chips implementing protocol conversion.

[0101] To enhance the adaptability of the instrument, rapid dynamic adaptation technology is required as support. In multi-scenario and multi-method applications, flexible and accurate dynamic configuration strategies are even more necessary. At the start of module operation, the configuration parameters sent by the instrument host are loaded, and the predetermined measurement mode and weighting coefficients are entered. Throughout the entire measurement process, the instrument dynamically adapts to changes in corresponding parameters based on changes in the measurement content to perform uninterrupted experimental measurement tasks. Based on application requirements (number of measurement channels, measurement purpose, etc.) and resources (bus transmission bandwidth limitations, etc.), the interface and data structure for external data transmission can be reasonably selected to control the data transmission volume.

[0102] The range switching adopts GPIO drive mode. The software changes the gain gear through instructions and can set the automatic range. When the result collected by ADC meets the range switching threshold, the software automatically implements the range switching.

[0103] Working principle: The present invention adopts full digital signal conditioning and synchronous acquisition of the detector signal current and the rod position signal to be measured to improve the accuracy of the parameter correction model. At the same time, it adopts multi-filter path conditioning and weighted correction to obtain correction data that matches the data measurement method. In addition, dynamic loading of configuration parameters is adopted to realize microcurrent signal conditioning, acquisition, and initialization of correction parameters.

[0104] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0105] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0106] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0107] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0108] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for measuring reactor reactivity, characterized in that: The following steps are involved: Performing weak current-to-voltage conversion and multi-channel filtering on the collected detector current signal to obtain multiple first voltage signals; Conditioning the collected rod position signal of the rod position to be measured to obtain a rod position conditioning signal; Performing analog-to-digital conversion on the multiple first voltage signals and the rod position conditioning signals respectively to obtain corresponding digital signals; Dynamically configuring a sampling rate, an acquisition and conditioning conversion gear, and a plurality of weighting coefficients according to a measurement range and a measurement method of multiple first voltage signals represented by digital signals; Converting the multiple first voltage signals into multiple first current signals, and fusing the multiple weighting coefficients with the multiple first current signals to obtain a composite current value; After the synthetic current value is time-synchronized according to the rod position conditioning signal, a corrected synthetic current value is obtained, and reactivity measurement and analysis is realized based on the corrected synthetic current value; wherein, the process of obtaining the corrected synthetic current value is specifically as follows: according to the initial sampling time of the rod position conditioning signal and the rod position interval value, the spatial correction factor at the corresponding moment is matched to obtain a sequence of spatial correction factors; with each sampling rod position as the link, the time association mapping of the spatial correction factor and the synthetic current value is realized, and the product of the spatial correction factor and the synthetic current value associated with the corresponding moment is calculated to obtain the corrected synthetic current value at the corresponding moment.

2. A method for measuring reactor reactivity according to claim 1, characterized in that: The method further includes: The actual sampling rate of the multiple first voltage signals and the rod position conditioning signals during analog-to-digital conversion is adjusted in real time according to the configured sampling rate.

3. The method for measuring reactor reactivity according to claim 1, wherein: The method further includes: The current operating sample rate setting for analog-to-digital conversion is adjusted in real time according to the configured sample rate.

4. The method for measuring reactor reactivity according to claim 1, wherein: The process of obtaining the synthetic current value is specifically as follows: Multiplying the weighting coefficient by the first current signal converted from the output corresponding to the corresponding filter channel to obtain a second current value; The multiple second current values ​​are summed to obtain a composite current value.

5. A reactor reactivity measurement system, characterized in that: include: A current processing module is used to perform weak current-to-voltage conversion and multi-channel filtering on the collected detector current signal to obtain multiple first voltage signals; The rod position conditioning module is used to condition the collected rod position signal of the rod position to be measured to obtain a rod position conditioning signal; The ADC acquisition module is used to perform analog-to-digital conversion on the multiple first voltage signals and the rod position conditioning signals to obtain corresponding digital signals; An MCU control module is used to dynamically configure a sampling rate, an acquisition and conditioning conversion gear, and a plurality of weighting coefficients according to a measurement range and a measurement method of multiple first voltage signals represented by digital signals; Converting the multiple first voltage signals into multiple first current signals, and fusing the multiple weighting coefficients with the multiple first current signals to obtain a composite current value; After the synthetic current value is time-synchronized according to the rod position conditioning signal, a corrected synthetic current value is obtained, and reactivity measurement and analysis is realized based on the corrected synthetic current value; wherein, the process of obtaining the corrected synthetic current value is specifically as follows: according to the initial sampling time of the rod position conditioning signal and the rod position interval value, the spatial correction factor at the corresponding moment is matched to obtain a sequence of spatial correction factors; with each sampling rod position as the link, the time association mapping of the spatial correction factor and the synthetic current value is realized, and the product of the spatial correction factor and the synthetic current value associated with the corresponding moment is calculated to obtain the corrected synthetic current value at the corresponding moment.

6. A reactor reactivity measurement system according to claim 5, characterized in that: The system also includes: The sampling rate configuration module is used to adjust the current working sampling rate setting of the ADC acquisition module in real time according to the configured sampling rate.

7. A reactor reactivity measurement system according to claim 5, characterized in that: The system also includes: The feedback drive module is used to adjust the current working sampling rate setting of the ADC acquisition module in real time according to the configured sampling rate.

8. A reactor reactivity measurement system according to claim 5, characterized in that: The current processing module includes: A current-to-voltage unit is used to perform I / V conversion on the detector current signal to obtain a voltage signal; The filtering unit is used to filter the voltage signal through three parallel processing channels with different filtering frequency configurations to obtain The first level conversion unit is used to reduce or amplify the filtered voltage signal to a voltage sampling range set in the ADC acquisition module.

9. A reactor reactivity measurement system according to claim 5, characterized in that: The rod position conditioning module includes: A signal conditioning unit, used for conditioning the rod position signal of the rod position to be measured; The second level conversion unit is used to reduce or amplify the conditioned stick position signal to within the voltage sampling range set in the ADC acquisition module.

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